What should be paid attention to when applying urea?

What should be paid attention to when applying urea? Please guide the introduction. Thank you very much for the following problems in the application of urea: first, try to avoid separate application. The ideal application method is to apply organic fertilizer first, and then to apply urea, calcium superphosphate and potassium chloride fertilizer in a reasonable formula. Second, it cannot be mixed with ammonium bicarbonate. The mixed application of ammonium bicarbonate and urea will greatly slow down the conversion of urea to ammonia, which is easy to cause urea loss and volatilization loss. Third, you can't spread it on the surface. Urea is sprinkled on the surface and can only be absorbed by crops after 4-5 days of transformation at room temperature. most of the nitrogen is volatilized in the process of ammoniation, and the utilization rate is only about 30%. Fourth, it can not be irrigated immediately after applying urea. Urea is an amide nitrogen fertilizer, which must be converted into ammonia nitrogen before it can be absorbed and utilized by crops. If it is irrigated immediately after application or before heavy rain, urea will be lost. Click to get more nitrogen, phosphorus, potassium application techniques click to get more fertilizer application techniques